If you're asking whether there's a tension between what they say and the message implicit in what they wear, the answer, of course, is yes. If you're asking how I would actually respond, that's partly a question of social judgment. If it seemed appropriate in the circumstances, I would probably ask them about this very point: if eating animals is wrong, how can wearing their hides be right? Perhaps they'd have an answer that managed to thread the needle. If so, I'd be interested to hear it.